Question

do numbers 5-10, show work, circle answer

A. 3 cm B.6.29 cm C. 0.3 m 5. A block is 5 cm x 7 cm x 2cm and has a mass of 128 g. If the density of water is 1 g/cc what is the apparant mass for the block once its submerged in Water? A. 58 g B. 70 g C. 140 g 6. Water is in a container that is open at the top and has hole at the bottom that water can escape. If the container is 2 meters deep and the container has a pressure of 50 Pa applied to the top surface, what is the flow rate from the opening at the bottom? A. 6.3 m/s B. 11.8 m/s C. 15 m/s 7. The first law of thermodynamics states heat added to a system results in work done and/or change in interanal energy of the system. A. True B. False 8. A metal rod has a length of 5 m and undergoes a temperature change of 50 degree celsius. If the coefficient of expansion is 20 X 10^-6/ degree celsius, what is the change in length of the rod? A. 500 mm 3.5 mm C. 6.3 ft 9. How much heat in calories is needed to change 30 g of ice at -7 degrees celsius to water at 40 degrees celsius? A. 3000 cal B. 1214 cal. C. 3705 cal 10. What is the efficiency of a heat engine that has an input tmperature of 500 degrees Celsius and an exhaust of 250 degrees celsius? A. 50% B. 32 % C. 22%.

Answer 1

(s) va 5x7 x 2 = 70cc Wapp . 0.128x 9.8 - (1x70x103) 9.8 Wapp 0.128 - 0.070) 9.8 Mapp SO ܩܘ (6) P+8Hg = 18r² V. 2 p + 2Hg va 2x so + (2x 2*5-8) looo Vo 16.3 mys (7) su= Q bow. (Tree) (8) 11 OL & LAT 3 5x10 m SL = (20x10-6)(5) (50) AL- s mm (9) Q (30 x0.5*7)+(30 x 80) + (30 XIX 40) e - 3705 Cal (10) 500 +27 3 = 773K 773-723 723 32 °%. e- Tha Te = 250 + 273= 523k